zex.m

Programs for the book Advanced Engineering Mathematics using MATLAB, 2ndEd.

% ZEX.M Show the Z-plane and frequency response of the function
%   H(z)=z/(z-.9)
% ZEX.M Show the Z-plane and frequency response of the function
%   H(z)=z/(z-.9)
clear,clf
num=[1 0]; den=[1 -0.9]; % Define numerator and denominator of H(z)
subplot(2,2,1)           % Keep plot small
figure(1)         
zplane(num,den)		 % Draw the z-plane
figure(2)
freqz(num,den)           % Plot frequency response